OEM superjet popoff en setup

[Vincent_85]

hi,

could somebody tell me what is the OEM popoff (psi), low jet, main jet and spring?
has the 760cc engine a different carb setup than a 701cc engine?
I have a 08 superjet with Factory B Pipe (mod), flame arrestors, solas 13/17, TBM pump cone, R&D intake, Techone Rideplate, MSD enhacer, 760 cilinder pistons and head.
Main jet 135
Low jet 70
Needle and seat 1.5
Spring 80

 

[Matt_E]

OEM Popoff for what engine and carbs?
A stock dual carb SJ engine has 1.5 N&S with 115g springs, for something like 52psi popoff.
The 760 OEM Yamaha engine has dual 44 carbs - popoff will be quite a bit different.

 

[Vincent_85]

I have the 760 cilinder, head and pistons but the OEM carbs (38mm).
but when I ride the ski with the 115 gr spring it is much lazier then with the 80gr spring. how can you explain that?

 

[Matt_E]

With 115g springs, the popoff may be too high, or your pilots may be too small.
Read this

 

[Vincent_85]

ok thanks for the help